The manual will specify the amount needed for a complete fill, and may also specify how much is needed for a partial fill (which is often what you do when changing the fluid). Failing to use the correct amount can damage your transmission.
If you don't have the owner's manual, you can try:
* Checking online resources: Search for your specific 1997 Chevy 1500's VIN (Vehicle Identification Number) and transmission type on sites like Chevrolet's website or repair manuals. The VIN is crucial to finding the precise information.
* Consulting a mechanic: A mechanic will know the correct capacity based on the transmission type in your truck.
Do not attempt to guess the amount of transmission fluid. Using too much or too little can cause serious damage to your transmission.
